Phytochrome is:

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(B) Phytochrome is a pigment found in plants that exists in two interconvertible forms: $Pr$ (which absorbs red light at $660 \ nm$) and $Pfr$ (which

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Absorption of $Pr$ and $Pfr$ in a reversible manner

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(B) Phytochrome is a pigment found in plants that exists in two interconvertible forms: $Pr$ (which absorbs red light at $660 \ nm$) and $Pfr$ (which absorbs far-red light at $730-740 \ nm$).These two forms are reversible,meaning $Pr$ converts to $Pfr$ upon absorbing red light,and $Pfr$ converts back to $Pr$ upon absorbing far-red light.Therefore,the defining characteristic of phytochrome is the reversible absorption of red and far-red light.

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